Soot blower



Jan.

L. J. BAYER soon1 BLOWER Filed May a. 1922 4' Sheets-Sheet 1illiinlllll!!! Il! 1 4 QI 4 Sheets-Svheet z sooT BLOWER L. J. BAYERFiled May .A 1922 Jan. 426 1926.

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L.. J. BAYER SOOT BLOWER Filed May a, 1922 4 Sheets-Sheet 4 Nn bh QNPatented Jan. 26, 1926.

UNITED STATES LEO JOHN BAYER, 0F ST. LOUIS, MISSOURI.

SOOT BLOWER.

Application filed May S,

To all whom it may concern.'

Be it known that. l, LEO JOHN BAYER, a citizen of the United States,residing at St. Louis, State of Missouri, have invented certain new anduseful Improvements in Scot Blowers, of which the following is a spec1-(ication.

'The present invention relates to improvements in vsoot blowers orboiler cleaners, particularly applicable to the Stirling watertube typeof boiler, or other boilers having tubes vertical or substantially so.The soot blower comprises a series of bloweriinits disposed at selectedpoints in the boiler so as to most effectively dislodge sootaccumulations, and the respective units are independently operated orcontrolled, the construction of these units being the subject matter ofthe present invention.

The principal objects sought by the present improvements are to providea soot blower unit wherein the operating valve which admits steam fromthe supply pipe to the blower pipe is actuated directly from thedrive-shaft which actuates the revolwing blower pipe; one wherein thevalve is controlled so as to remain open during the period that theblower pipe is rotated through its predetermined blowing arc1rrespective of the direction of rotation of 'the blower pipe; onewherein the operating valve is controlled by a suitable cam which may bereadily replaced by a cam of different contour to vary the blowing areof the blower pipe; one having its supply pipe flexibly supported fromthe boiler wall to allow for contraction and expansion of said sup l ie.

Fliiiitlibii)v objects and advantages of the blower units will be betterapparent from a detailed description of the invention in connection withthe accompanyingdrawings, in which- Figure 1 represents a side elevationof a- Stirling boiler and setting showing the several 'banks ofcirculating water-tubes and baiiles, side walls of the setting beingremoved, and the remaining walls shown in section, and the blowercomprising the units of the present improved type being shown inelevation; Fig. 2 is a combined side elevation and section of the lheadend of the. second blower unit, the side wall of the ,setting being.shown in section, and parts being broken away; Fig. 3 is a sideelevation of the opposite end of the second blower 1922. Serial No.559,290.

unit, the side wall of the setting and the tubes being in section; Fig.4- is an enlarged yiew of a part of the blower pipe and its jacket,partsof two adjacent sections being shown, and part of one section beingbroken away; F 1g. 5 is ak longitudinal section through the blower pipeand jacket taken along the plane of the nozzles; F ig. 6 is a verticalcross-section taken on the line 6-6 of 4; Fig. 7 is an enlarged verticallongitudinal section through the head of the blower unit; Fig. 8 is afront elevation of the blower head with parts broken away; Fig. ,9 is avertical cross-section takenon the line 9 9 of Fig. 7; Figures 10 and 11are enlarged detail views of the valve and actuating mechanism therefor;Fig. 12 is a detached face view of the ring that is inter- V posedbetween the wall sleeve and supporting bracket of the blower unit; Fig.13 1s a vertical cross-section taken on the line 13-13 of Fig. 7, andshows the intake end ofthe blower pipe; Fig. 14 is a verticalcross-section taken on the line lik-14 ofV Fig. 7, and shows the intakeend of the air jacket; Fig. 15 is a side elevation of the first blowerunit, a part being broken away, and parts being shown in section; Fig.16 is an enlarged vertical cross-section taken on the line 16-16 of Fig.15; and Figures 17 and 18 are detail views of a modified form of valveactuating mechanism.

Referring to the drawings, F represents the boiler setting, B the lirebox, 1, 2, 3, the front, middle, and rear shells for steam-andwaterrespectively, 4 the mud drum, 5 the front bank of circulatingwater-tubes connecting the shell 1 with the mud drinn, 6 the middle bankof water-tubes, 7 the rear bank of water-tubes, 8 the steam tribesconnecting the front an-d middle shells, 9 the steam tubes connectingthe middle and rear shells, 1() the water circulating tribes between theshells 1 and 2, and 11 the tiling or baffle directly over the tubes 10.The front baille 12 carried by the rear members of the front bank oftubes is provided with a shelf 13 at a point below but adjacent to theupper end of thebaiile, the middle baffle 14 disposed along the rear ofthe middle bank of tubes reaching from the shell 2 to a point near theIn the present embodiment ot my invention I provide the middle battle 14at an intermediate point of its height with a rearwardly projectingshelf 14 above which the fourth blower unit ot the present improvementis installed. The arrows in Fig. 1 rep-- resent the general coui seofthe tui-nace gases and combustion products, the same traveling fromfront to rear and making practically tour passes, as clearly apparentfrom the drawings.

The several blower units herein may be referred to as No. 1, No. 2, No.3, No. 4, and No. 5, according to their positions in the boiler fromtront to back in the line ot iiow of the gases, and vary somewhat inconstruction, since ilos. 1 and 2, being in the hottest part of theboiler, are'air-cooled, while Nos. 3, 4, and are not subject to suchhigh ten'iperatures, and need not necessarily be provided with coolingmeans. Then again, blower unit No. 1, located ontne bridge-wall, may ormay not be provided with a revolving blower pipe, the blower pipes oiall the other units, however, being revoluble.

Since unit No. 2 embodies all ot the features of the present invention,both for revolving the blower pipe and Jfor cooling the same, this unitwill be tirst described. P represents the steam or cleaning-fluid supplypipe, dry steam being the usual liuid employed as well understood in theart.

The boiler side wall F is provided with an opening O below the tubes 10,and a wall sleeve 16 is fitted tightly into this opening, said sleevehaving a square flange 16 on the outer end into the corners of which isbolted a supporting bracket 17 `tor the blower head H about to bedescribed. Blower unit o. 2 is provided with a blower pipe 18 supportedat the outer end in the head H, said blower pipe being confined in ajacket or air pipe 19 spaced therefrom, the assembled blower pipe andsleeve being supported at suitable points along its length by brackets2O suspended from the tubes 10. One end of the jacket 19 is open to theatinosphere, terminating in a spider 21 mounted on the blower pipe 18,the openings o between the ribs ot the spider permitting air to enterthe jacket ireely and circulate about the blower pipe, linallydischarging through a riser to the flue S, said riser being connected bya swivel 23 to the jacket. However, there are other ways of inducing anair circulation through the jacket 19, and do not wish to be restrictedto that shown herein. Owing to the great heat in the boiler in thevicinity of unit No. 2, the air circulation through the jacket 19 is ofitself insuficient to keep the jacket cool enough to prevent warping. Itherefore build the acket 19 in sections a, c., etc., each section beingconnected (by a sliding t) to the adjacent section by an internal sleeve24, a slight cleai'- ance X being provided between the sections c topermit ot expansion under heat (Fig ures 4 and 5). By virtue of thisconstruction expansion and contraction of the jacket is compensated forand buckling and warping ot the unitdoes lnot take place, since anytendency in this regard in one section would be counteraeted by anothersection, and the eiiect could not be cumulative, the sections actingindependently.

The jacket 19 is maintained in spaced relation with the blower pipe'18by radially disposed studs screw-threaded through the sections c intosliding contact with the blower pipe 13, the studs in any one planebeing 900 apart and distributed in alineinent and equally spaced alongthe jacket. Opposite to one row ot studs are the nozzles 26 adapted todischarge steam into the bank of tubes 10, each nozzle being`screw-threaded into the blower pipe 13 and having an intermediatepolygonal enlargen'ient 26, the inner surface of which bears againstsaid pipe, and the outer surface of which is contoured to bear snuglyagainst the inside of the jacket 19. The discharge end 26 ot each nozzleprojects into an opening t in the jacket, said opening being largeenough to provide clearance around the nozzle end 26 to permit otrelative longitudinal movement oi acket and blower pipe, due toexpansion and contraction, without shearing ott' the nozzle. Theenlargement 26 closes the opening t on the inside.

The blower pipe 13 receives steam through the blower head l-l. which isconnected to the supply pipe P by a riser 27, which terminates at thetop in an elbow 23.

rThe blower head H comprises the actuating mechanism of the unit, andwill now be described, A suitable housing 29 is provide ed with anannular bearing support 30 adjacent tbe open end of the jacket Y19. saidsupport having a boss 31- formed on its up per surface, and a fork 32projecting down wardly from its lower surface, the :former carrying astud 33, and the latter forming one member ot a universal joint J. theother member 34 being formed on the upper end of a pin The stud 33projects upwardly through a laterally disposed slot s `Formed in a lug36 projecting outwardly from the bracket 17. The pin 35 projectsdownwardly through an opening u in a lug 36 extending outwardly fromsaid bracket and directly beneaththe lug 36, and a cushion spring 37 iscoiled about pin 35 between joint J and the lug 36. By virtue of theuniversal joint J and the connection ot the slot s and stud 33 theheadervI-I is flexibly connected 1o the rigid bracketl?, and is freelymovable both vertically and laterally relative to the bracket responsiveto expansion and contraction of the riser 27 or other stresses put uponthe unit. Consequently any change in the relative positionv of therespective parts of the blower unit due to the trying vconditions underwhich it must function are compensated for, thus avoiding distortion andstrain.

The blower pipe 18 is supported on roller bearings 38 within the bearingsupport 3 and is provided with a ball-end-thrust bearing 39 confinedbetween the roller bearings and shoulder o in the support 30. Astbe pipe18 moves in and .out under contraction and expansion the header H moveswith it,

yielding to the necessary degree in the bracket 17.

A gear housing /L is connected to the bearing support 30, the front wall.40 of the housing being bolted to it by bolts 5, Z), etc., a stuflingbox c provided with a packing d, and gland e, adjoining the housingwall. The intake end of the blower pipe 1.8 is surrounded by a casing 41formed integral with the stuffing box c, said casing having a dependingvertical leg 42 and a front cover plate 43 through which extends apintle 44 carrying a pointer 44 on its front end, the opposite end beingscrew-threaded over the end of pipe 18. A stuffing box 46 is provided onthe outside of the cover plate 43 to prevent steam from leaking out ofthe casing 41.

A drive shaft 47 is mounted in the outer wall of the hollow leg 42 andhousing 7L, traversing the housing wall and inner wall of the leg 42 inwhich is a stuffing box 48. That part of the shaft 47 within the leg 42carries a double worm 49 meshing with a worm-wheel 50 freely rotatableon a shaft 51 extending across the leg 42, and the part of the shaft 47within the housing 7L carries a pinion 52 meshing with a gear wheel 53within the housing and set-screwed to the blower pipe 18, a pulley 54being keyed to the. drive shaft between the leg 42 and housing z.. Apair of cams 55, 55 of identical shape are set-screwed (or otherwisesecured) to the hubs of the worm-wheel 50, each cam having oppositesurfaces m, m of long radius and opposite surfaces n, n of short radius`joined with the surfaces m, m, and a pair of rollers 56, 56, mounted onthe top of a valve cage 57 are adapted to ride over the surfaces m, a,of the cams. The lower part of the cage is provided with a valve 58 fromwhich Idepends a stem 59 operable in a. guide 60 formed in the elbow 28screwed into a flange 61 terminating the leg 42. A valve seat 62 isformed at the base of the fiange 61 on which the valve 58 is normally-seated by the tension of a spring 63 coiled about the valve stem 59 andconfined between the guide 60 and valve.

The ratio of pinion 52 to gear 53 is 1 to 5, and the ratio of worm 49 toworm-wheel 50 is 1 to 10, consequently when the shaft 47 is rotated ineither direction, by pulling on a chain 64 passed over pulley 54, fiverevolutions of the pulley will impart one revolution to the blower pipe18, and one-half revolution to the cams 55. Therefore, when a halfrevolution, or from low surface n r to opposite surface 1.11, duringwhich halfturn lthe valve 58 will be opened and steam admitted to pipe18, since the rollers 56 must pass over one high surface m interme diatethe two low surfaces n'. The pointer 44 indicates to the operator theposition of the nozzles 26 which are in line with the pointer. The steamon entering the blower pipe past the open valve 58 will discharge fromthe nozzles 2G throughout the period that the valve rollers 56 areriding on the surfaces m. Since a half revolution of the cams is equalto a complete revolution ofthe blowerpipe, a cam surface m equal to a 60are will permit steam to blow from the nozzles through a 1200 arc ofrotation of the blowing pipe. In this case it may be said that theblower has a 120o blowing arc since the supply valve is completely openduring thisy period. VOf course, some steam will be discharged from thenozzles during the periodl that the valve is passing from closed to openposition, or vice versa, but this is immaterial. units requiring ablowing arc of more or less than 1200, the cams 55 may be replaced byothers wherein the surfaces m and n are of the proper length to meet thedifferent requirements.

It will be observed that the pulley 54 may be rotated Y'in eitherdirection for operating the blower since the operating mechanism isconstantly in operative condition, and there are no impinging parts orstops such as have heretofore been used on blowers of this generalcharacter. This is a very desirable feature since boiler roomaccessories sometimes encounter pret-ty rough handling. Furthermore allthe working parts are encased so that they are protected from dirt o-rother foreign matter. Then, again, the valve being actuated directlyfrom the drive shaft by gearing as is also the pipe 18, the valve andpipe are bound to operate synchronously and positively.

To prevent cold air from entering the boiler between the jacket 19 andsleeve 16, I provide an annular recess r in the bracket 17, and a ring65 is placed in this recess, said ring having a close sliding fit withthe jacket, and a series of spring clips 65 are secured to the ring inspaced relation, said clips maintaining the ring against the wall sleeve16 and closing the opening about the jacket.

Obviously, for blowerl Blower unit No. 1 (Figures 15 andy 16) likewisebeing in a very hot part of the boiler, has its blower pipe 18surrounded by a jacket 19 connected by a riser 66 with the flue S toprovide for a circulation o1 air around the blower pipe, but instead ofbeing supported from the boiler tubes the unit is supported in saddles67 on the bridge-wall IV and in spaced relation thereto to prevent theconduction of heat to the unit from the bridgewvall. In the presentinstance the unit is stationary (consequently no blower head isnecessary) and the blower pipe 18 is connected directly to a short riser68 in which is a steam supply valve 69 for independently controlling theblowing operation, the riser 68 being connected to the steam supply pipeI). In other respects this unit is the same as No. 2, and if desired maybe provided with ai head for rotating the blower pipe.

Units No. 3, No. 4, and No. 5 are similar in all respects to unit No. 2except that the jacket 19 is dispensed with since these units are morerearward in the boiler, and are not subjected to such excessive heat.However, I reserve the right to provide any of these units with jacketsfor air circulation if at any time it is desirable.

In Figures 17 and 18 I show a modified form of cam 55 for actuating thevalve 5S, said cam comprising a housing 70 mounted on a single worm 71,the housing having teeth 72 formed on its inner surface for end gagingwith the worm thread. The worm is volvedin the opposite direction whenthe operation is repeated.

Obviously the invention is susceptible to other modifications, all ofwhich cannot be described, and I do not Wish to be understood asrestricting myself to the construction herein shown.

Having described my invention, I claim:

1. In a soot blower for boilers, the combination with a steam supplypipe terminating at one end in a head, of a peripherally ported blowerpipe revolubly supported at one end in the head, a valve in said headfor controlling the steam flow from the steam pipe to the blower pipe, agear wheel fixed on the blower pipe, a drive shaft, a pinion on one endof the drive shaft and meshing with said gear wheel, a worm on the otherend of the drive shaft, a worm wheel meshing with said worm, and a camfixed to the worm wheel for actuating the aforesaid valve on revolvingthe drive shaft.

2. In combination with a boiler and setting therefor, a soot blower unitcomprising a blower pipe, a steam supply pipe therefor, an operatinghead communicating with the blower pipe and supply pipe, and means forsecuring the soot blower unit to the boiler wall comprising a wall platehaving an opening for receiving the blower pipe, a pair of spaced,vertically alined lugs projecting from said wall plate, and means foriieXibly connecting the operating head to the wall plate comprising auniversal joint arranged between the head and the bottom lug and a pinand slot connection between the head and the upper lug.

In testimony whereof I hereunto affix my signature.

Luo JN0. BAYER. y

